Pen



FIG. 1 is a perspective view of a pen showing my new design;

FIG. 2 is a front view thereof, the rear, left and right side views being the same as the front view;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is an exploded perspective view of the pen shown in FIG. 1; and,

FIG. 6 is a perspective view of the pen shown in FIG. 1, with the pen cap removed and placed on the opposite end of the pen.

The surface stippling in FIGS. 1, 2, 5, and 6 represents a contrast of color or material. 

The ornamental design for a pen, as shown and described. 